FTP Servers and Security - Three methods that Secure FTP Servers use
FTP (File Transfer Protocol) has been the basis for file transfer since the dawn of the internet. The truly remarkable feature about FTP was that it was operating system independent. Files could be smoothly transferred between Unix, Windows and any other operating system. The other cool feature about FTP was that a simple validation mechanism consisting of a username and a password could be used to limit access to files. However, the actual data itself was transferred unencrypted and it was easy to intercept and listen in on an FTP connection. The internet itself had very minimal security built into it. Consisting of many smaller independent networks that stretched across the globe, the path that a data packet took to get from point A to point B was unpredictable. With the popularity of the internet, it became essential to be able to transmit many types of critical data with some amount of security. Netscape Communications solved the security problem on the internet by developing the Secure Sockets Layer Protocol (SSL) which used public key cryptography to encrypt data transmitted over the internet. This is still the widely accepted security mechanism and is implemented by all web browsers. FTPS Secure File Transfer Modifications to the FTP protocol were proposed to incorporate the use of SSL for encrypting file transfers over the internet. The modified mechanism is referred to as FTPS. In order to maintain backwards compatibility with the original file transfer protocol, an FTPS connection could either be explicit, where the connection between the client connection and the server starts out as regular FTP and then negotiates a secure connection, or implicit where the connection starts out being encrypted. HTTPS Secure File Transfer Since a web browser is already capable of public key cryptography, simple downloads and uploads can be performed directly through a web browser using the HTTPS protocol. This means that special FTP Client software is not required. SFTP Secure File Transfer The Secure Shell protocol also known as SSH was developed by Tatu Ylonen to enable secure access to remote shells using public key cryptography and replace Telnet and other non secure shells. This protocol has since evolved to also support a file transfer mechanism known as SFTP. The main advantage of this mechanism is that it did not require the opening of an additional data channel connection for transferring files. All of these three methods of secure file transfer are based on public key cryptography and all of them are equally capable of securing the transfer of critical files across the internet. The only drawback of these methods is that there is a data overhead associated with encrypting files. There is also a performance overhead associated with encrypting the files at the source and decrypting them at the destination. Because of this, system administrators sometimes use regular FTP for file transfers within a secured internal network. However, for transferring files over the internet, this is a small price to pay in exchange for the guarantee that sensitive files reach their destination without being intercepted or tampered with.Okay, you now know about the three types of secure ftp servers. If you are looking for a secure FTP server to run on your windows system that can support all three secure file transfer mechanisms, be sure to visit <a href ="http://www.sysax.com/">http://www.sysax.com/</a> and download <a href ="http://www.sysax.com/download.htm?c=48#sysaxserv">Sysax FTP Server</a>
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Computer Backup
It’s happened to most of us; we’ve lost a document or a folder because there was no computer backup. Whether you lost a few lines you were typing because of power failure or your entire system crashed, computer backup is the only way to prevent such mishaps from destroying your files. Computer backup can be basic or sophisticated, costly or simply the price of your average floppy disk. Depending on your needs and the importance of your files, you will need a computer backup system that reflects your budget and your lifestyle. Many computer users prefer to keep it simple and back up their data with a floppy disk or by copying and pasting documents. This is the most basic form of computer backup, but it is not satisfactory for everyone. Floppy disks often wear out, and you can have files stored on floppy disks for years that might be not perform if they are stored on old disks. On the other hand, if you use your files quite frequently, your floppy disk could wear out, which creates another problem for your floppy disk storage. If you simply store your document elsewhere on your computer, it might not survive a complete computer crash, although minor annoyances should not interfere with your files. Because of problems with viruses, computer crashes are becoming a more frequent occurrence for many PC users, and therefore, computer backup software is the best option for many consumers. There are many files that are worth the time and investment involved in obtaining good computer backup software. Examples of such files are: ? Bank records ? Personal documents ? Digital photos ? Address books ? Software downloads ? Special projects The best computer backup software not only creates a copy of your documents automatically, but it uses encryption algorithms to protect your information from unauthorized access and spyware. Your filename will also be encrypted to protect against intrusions. Most computer backup software is quite user friendly, and new files can be added instantly at the click of a mouse. In addition to many great features, most computer backup software will enable you to: ? Create new backup programs ? Select files and folders for backup ? Define compression settings ? Choose target of backup ? Store backup info in various locations The best computer backup programs are not rigid, but allow the user the flexibility to choose where and how their files will be stored. You can choose to have everything copied automatically, or specify which files you wish to have a backup. If you have a large volume of material to store, you can select compression settings, which will minimize the size of your documents and will enable you to store more information. You can also choose where you want your backup information to be stored, and you can place the data in various locations automatically, for instance, in your hard drive, USB stick, Network folder, CD, DVD and Remote FTP Server. You can also create a simultaneous backup communication between a remote FTP server and local storage devices. Your computer backup software should provide easy user interface, the option to store your data in multiple versions and the capability to restore your files to their original folders. Most programs have a very easy to use help menu, and many have service lines to help customers who wish to communicate with an assistant. You can also obtain special features for your computer backup software, such as a disaster recovery CD or DVD, which will get your computer back up and running after a crash. You can have peer to peer backups for extra protection and virus scanning capabilities that will safeguard your valuable files against tampering. Computer backup software varies in prices, and it is worthwhile to invest in the best program you can afford, especially if your business depends on valuable files. Don’t let an unexpected computer crash destroy your valuable data, but invest in computer backup software today. Matt Garrett <a href="http://www.xoftspy.co.uk">www.XoftSpy.co.uk</a> <a href="http://www.data-recovery-experts.net">www.data-recovery-experts.net</a>
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Gain (Gator) ? The Virus
It just amazes me how there are companies out there, claiming to be legitimate businesses, who are distributing what can only be known as spyware, adware, malware, badware, and viruses. These companies get away with it due to obscure clauses and legal double-speak in their terms of agreements, if they bother to have one at all. Some websites will download unwanted spyware and badware on your computer without any consent from you at all. They claim that all of this information gathering has a legitimate purpose and that people are over-reacting. Some people do not know what a virus is. It is simply a program. Just like any other program you download and use everyday. It must be installed onto your computer. The difference between a virus and a legitimate program lies in the purpose for which it was created. A legitimate program was created to help you perform a task. A virus was created to harm your computer or steal information from you. The other difference is the first one is legal, the latter is not. A virus is legitimately defined as an executable program, however, any script or macro should be included in that definition in my opinion. If they are written with the intent of causing harm to a user?s computer or they are written and installed on a user?s computer in order to gather information on that user, then they are no better and no different than a virus, and should fall under the same laws that apply to viruses. If these programs like GAIN, Gator, and WinFixer are so legitimate, why are the techniques they use to install it on a user?s computer so sly? Why are they using these sneaky tactics, such as downloading it onto someone?s computer without disclosing what it actually is to the user in a clear manner? Why do they write their malware, badware, and adware in such a way as to have it resist your efforts to remove it from your computer? Your computer is something you bought and paid for. You have the right to decide what will be installed on your computer. Anyone who writes a program that resists your ability to choose to remove it is a violation of your rights. Our elected officials don?t know how to surf the web for the most part, let alone actually understand what the definition of a virus is and how to legislate against spyware and malware. Software companies who write legitimate programs lobby them to make sure they do not pass any laws that regulate the sale of software. Example: Name any other product or service where you must pay up front for it before you even see the contract you must sign and agree to before you can use it? Not only that, but large corporations support the use of malware, adware, spyware, badware, and viruses that gather information from users without their knowledge. They in turn buy that information to build their own consumer databases and use that information to sell you products. They pay to know what your habits are. As long as they are willing to pay for that information, companies like GAIN will continue to steal it from user?s and sell it to these companies. If you want to know how many programs on your computer are gathering information about you, you will need to get some type of spyware detection software. There are several available, however, be careful, some of those advertising the removal of spyware are actually installing it on your computer themselves. Make sure you do a search in your favorite search engine to find out about the brand of software you are thinking of downloading. If your computer is infected with Gator or GAIN, you may have to use anti-virus software to remove it. Many of the anti-virus companies have removal instructions on their website. If GAIN were a legitimate company and legitimate software, it?s highly doubtful it would have to be removed by an anti-virus program. I hope this article has been helpful to you. GAIN, WinFixer, and other programs that act in this unethical manner should be considered viruses and held accountable for the harm they do to your computer and liable for the time it takes to remove them. That?s my opinion. D. David Dugan is the president of DD&C (<a href=http://www.dugancom.com>http://www.dugancom.com</a>) and personally helps to maintain their computer support forum at <a href=http://forum.dugancom.com> http://forum.dugancom.com</a> as well as their Spyware Information site <a href=http://spyware.dugancom.com> http://spyware.dugancom.com</a>.
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